fat - a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides); "pizza has too much fat"

triglyceride - glyceride occurring naturally in animal and vegetable tissues; it consists of three individual fatty acids bound together in a single large molecule; an important energy source forming much of the fat stored by the body

macromolecule, supermolecule - any very large complex molecule; found only in plants and animals

oil - a slippery or viscous liquid or liquefiable substance not miscible with water

phospholipid - any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes

wax - any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water